Device for rolling with repeaters in open mills



March 3, 1959 w. LANGBALLE ET AL 4 Sheets-Shee; 1

Filed Jan. l5 1953 March 3, 1959 w. LANGBALLE x-:T AL 2,875,553

DEVICE FOR ROLLING WITH REPEATERS IN OPEN MILLS Filed Jan. Al5, 1953 4 Sheets-S`neet 2 Ff?. 'ign 6 I m n l J March 3, 1959 I w. LANGBALLE ETAL 2,875,553

DEVICE FOR ROLLING WITH REPEATERS IN OPEN MILLS Filed Jan. 13, 1953 4 Sheets-Sheet 3 pf?. /8 /9 'I March 3, 1959 Yw. LANGBALLE ErAL DEVICE FON ROLLING WITH-REPEATERS IN OPEN NLLs Filed Jan. 13. 1953 4 SheetS--SheeI 4 United States Patent O 875,653 nnvicnron.RoLLiNofwrrH'RErnnrERs1N oPENMiLLs Wilhelm I'jangualle' andHans-W; R'iddervold, Oslo, Noir-` Application January 13,r `1953,` SerialNo. 330,938 6 Claims; (CIL Sil- 52) rlrolltwire'rod' an'd sniall sections in alternating twotr'ains hasbeconie more and-more customary duringv thelast ten years owing to the faet'that relier guides (they American patentspecification 2,506,682) and new rolling" milltands (the American patent specification 2,516,681)A have enabled areliable rolling ofv ov'als as Well as squares with repeaters without movable parts. This rolling process causes no difliculties up to a rolling speed of 8 m./sec., but at a higher speed the same phenomenon as that of a lash arises owing to the centrifugal force. A pig tail end or a doubled tail end which gets stuck in the entry guidesappears on the rod to be rolled.` Therod is pulled oi and the end remains in the entry guides whereby the following rod cannot pass the entry gidesand get a cobble. The centrifugal force heingin proportion to the square of the speed, the diiii'culties increase rapidlyl when the speed increases. In order to eX- plain this and the purport of the invention reference is made to the accompanying drawings. Figure l shows a pig tail end and Figure 2 a doubled tail end of the rod, said deformations arising during rolling athigher speed, asmentioned above.

Figure 3`illustrates diagrammatically andv in plan view two pairs of rollers with a repeater.

Figures 4-19 show differenternbodiments of the invention relating to a whip channel together with appurtenant devices. i

Figure 4 shows the whip channel, the lid being lifted olf, Figure 5 shows a section along the lirle V-V in Figure 6 and the latter figure shows a section along the line VI-VI inFignfe 5. Figure 7 shows adilerent shape of the whip channel, thelid being lifted-oliFigure 8 shows a section along the line VIII-VIII in Figure 9 and Figure 9` shows a section along the line IX-,IX in Figure 8;

Figures 10-12 show another embodiment of the whip channel, the lid being lifted ofl in Figure 10, and Figures 11 anddlz showing sections along the lines Xr-XI and XII-XII in Figures 12 and 1'1` respectively.

Figure 13 is a plan view of a combined repeater and whip channel according to the invention and Figure 14 shows a section of the sam-e repeater along the line XIV- XIV in Figure 13.

Figure 15 is a longitudinal section through a combined repeater and whip channel according to XV in Figure 16, and Figure 17 is a cross .section according to XVI in Figure 16.

Figure 18 shows a longitudinal section through a combined repeater and whip channel intended for two strands according to XVII in Figure 19.

In order to clarify the technical conditions for this invention reference is iirst made to Figure 3 in which the first stand is designated by 1, the second stand by 2 and the repeater by 4. The latter which is of a common type, has a straight part 4a and a bow-shaped outer edge on the guide portion 4b. When the rst end of the rod has passed the repeater and has been gripped by the rolls 2 the rod endeavours to grow. Then it will vibrate in the straight portion 4a of the repeater and jumps over the'u outer edge of .the repeater. at 4b" `after' which the loop. can growfreely; Allthe time the bent portion of the rod pulls the pair of rolls 1 and 2. When the tail end' re` leases the first stand the end will accelerate, and the loop designated by 3, grows rapidly, as shown by' dashfand-dot lines' in Figure 3. By this thel deformations shown in Figures 1 and 2 can arise;

The object of the invention is to prevent-` the loop from growing abnormallyv after the tailendof 'the' rodi has been' released from the stand I, and; further to mod crate the whipmotions ofthe tail end.

TheV whipchannel mainly consists of a lower part 5 and a lid 6. It isnot' shown howv thek whip channel isv mountedy as it is very simple, and the foundation can be a frame of arbitrary kind. The Whip channel'is' to be placed behind' the repeater l'or` replace its bow-shaped middle portion 4b. Ascanbe seen from Figures 41-19 a series of. collars 7 which establishessentially a plurality ofgrooves arranged successively i. e. eachA behind the other in the channel are characteristic' for the said whip channel. The` collars 7 are arcuate and extend substantially from one side ofthe channel to the other. Fig

ures 4 9 show the most characteristic forms intended for the highest speeds. The collars proper are provided at the bottom of' the channel, while the lid 6 is provided correspondingly with similar arcuate collars in the form` of corrugations 7a located in general registration withv the collars 7 in the lower part 5; Here the collars 7 form a series of repeaters. When the loop grows during the rolling, the partof the loop located in the whip chan nel will begin to vibrate each time the rodtouches one of the collars 7 in the channel, the rod jumping over the flange. When the tail end leaves` the precedingvstand,V

the coil is increasedtillit rests against the nearest collar 7. A couple of such loops are indicated by dash-and-dot lines in Figures 4 and 7. The collar absorbs the centrifugal force from the loop and the speed of the end of the rod remains unchanged and passes quietly through thel whip channel andthe succeeding stand. The position or" the loop can be seen from the sections in Figures 5, 6, S and 9 in relation to the nearby collar in the vertical direction. In the embodiment of Figs. 7-9l, the arcuate collars 7 areeach provided with a flange portion 7bextending horizontally from the concave side ofthe collars to establish hook-like projections facing in the direction of the roll stands.

The embodiment according to Figures 110, 1l and 12 shows a modication ofthe whip channel intended'` for moderate speed. The bottom of the channeliand thelid are symmetrically corrugated, as can be seen from Figure' 11, said corrugations forming oblique flanges. In this case the loop need nothe thrown up, as in a repeater# formed whip channel, but encounters a certain resistance when it mounts the oblique collars and furthermore knocks against the oblique collars of the lid..

The embodiment according to Figures 13 .and 14 shows a combination of repeater and whip channel in which each stand can be controlled with regard to speed. The repeater resembles as far as its fundamental form is concerned, the repeaters hitherto used and is provided with the following device for the control of the roll speed. An arm 12 is mounted on a pivot 13 under the bottom plate of the repeater, so that the arm can swing to and fro between the limit positions as indicated in Figure 13, one by dash-anddot lines, the other by the line of short dashes, to which position the arm is always moved when released, by some external force, for example a spring. At the outer end of the arm there is a roller 15, which through a slot in the plate ascends a distance above said plate. One end of a link 16 is attached to the arm 12, the other end of the said link being connected to a control member 17 which serves to adjust the value of Ptented Man 3, 19u59.

- the outer collar 10.

3 an electrical control element such as a resistor contained in a casing 18, wherebylthe speed of the motor, which drives the roll is controlled in accordance with the value of the resistor which is connected in the electrical circuit of the motor the speed of the roll thus being adapted to the length of the loop. The device functions in the following manner:

The irst end of the rod runs along the outer collar and the speed of the succeeding stand is greater so that the loop is decreased until it hits the roller 15. Thereby the arm, due to pulling of the loop, can be more or less moved and controls the mutual speed of the stands via the variable resistor in casing 18. Thus the rod itself controls the length of the loop and when the tail end leaves the preceding stand, the rod is thrown by the centrifugal v force towards the outer collar which then eliminates the centrifugal force, so that the tail end runs quietly along the outer collar. In this case the outer collar of the repeater serves as a damper for the tail end.

All the whip channels according to the above embodiments can of course be built together with the repeater, and the whip channels can also Ibe equipped with photoelectric cells according to Figures 4.12 for the control of the loop length.

Figures -17 show a combined repeater and whip channel intended for higher speed than that in accordance with Figures 13 and 14, which speed has proved reliable up to m./sec. At a higher speed one may risk that the tail end accelerates so vigorously that the rod is thrown up owing to the violent braking against the outer collar 10. In the design according to Figures 15-17 photoelectric cells 19 or the like carry out the control of the loop, the upper or lower part of the whip channel being provided with slits which admit the light emitted from the red-hot rod to the respective photoelectric cell. Inside the outer collar 10 there are damping flanges, for example of the same shape as those of Figure 11. When the rod leaves the stand 2, the increase of the loop is moderated, so that the tail end possibly does not reach It the distance between'the stand 2 and the combined repeater and whip channel is great, the tail end has longer time to let the centrifugal force take effect. Then it will be more ditlicult to dominate the whiplash and thereby the design according to Figures 15-17 or a similar combination will be necessary.

Figures 18 and 19 show a similar combination but made for two strands. The speed is controlled by photoelectric cells 19, but as exactly the same reductions cannot be obtained in the two rods running through simultaneously, damping flanges according to Figures l1 and 8 have also been placed outside the two outer collars.

With whip channels in accordance kwith the invention a speed of 18-20 m./sec. has been obtained as finishing rolling speed in comparison with 8-10 m./sec. which was possible in earlier known looping trains.

Cil

Having now described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A repeater device for'use with looping mills and which is placed between parallel arranged mill stands to form a loop in the rod for introduction to one mill stand after leaving the other, vsaid repeater device comprising an elongated channel member having a bottom and upstanding sides extending from end to end of the working zone thereof whereby a rod enters adjacent one side, loops and reverses out of the channel adjacent the other side, said bottom being provided with a plurality of upstanding transverse arcuate projections extending from one side of said member to the other, said projections being arranged each behind the other in the direction away from the mill stands and with the concave sides of said projections facing toward said mill stands and providing abutment retarding surfaces in said direction, said pro` jections establishing therebetween a plurality of guide channels in said member for successively receiving and guiding the rod loop as the length of said loop grows during the rolling process.

2. A repeater device as delined in claim l wherein said upstanding projections are each provided with a ange portion extending horizontally from the concave side thereof to form a hook-like projection.

3. A repeater device as dened in claim l and which further includes a lid member arranged above said member having said upstanding projections, said lid member including a plurality of depending arcuate projections extending from one side of the lid to the other, said depending projections being arranged each behind the other in the direction away from the mill stands and with the concave sides of said projections facing toward the mill stands to establish therebetween a plurality of guide channels cooperative with the guide channelsformed by said upstanding projections.

4. A repeater device as defined in claim 3 wherein said depending projections of said lid member have rounded edges to establish a corrugated configuration.

5. A repeater device as defined in claim l wherein said upstanding projections on said member are constituted by.a series of collars stepped upwardly in the direction away from the mill stands.

6. A repeater device as delined in claim 1 wherein said upstanding projections on said member are surfaces which slope upwardly in the direction away from the mill stands.

References Cited in the file of this patent UNITED STATES PATENTS 

